Portable drinking straw case



FIG. 1 is a perspective view of a portable drinking straw case showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures illustrate the portions of the portable drinking straw case that form no part of the claimed design. 

CLAIM The ornamental design for a portable drinking straw case, as shown and described. 